JEE PYQ: Hydrogen Question 24
Question 24 - 2019 (09 Jan Shift 2)
The temporary hardness of water is due to:
(a) $\text{Na}_2\text{SO}_4$ (b) NaCl (c) $\text{Ca(HCO}_3)_2$ (d) $\text{CaCl}_2$
Show Answer
Answer: (c)
Solution
Only bicarbonates cause temporary hardness, whereas chlorides and sulphates cause permanent hardness.